The charts in silver above reflect the results of the NBC News / Wall Street Journal Poll -- done between August 9th and 12th of a national sample of 900 registered voters, with a 3.27 point margin of error.
The charts in purple reflect the results of the CNN / SSRS Poll -- done between August 12th and 15th of a national sample of 1,108 respondents, with a 3.7 point margin of error.
